Geometrical OpticsMedium
Question
An astronomical telescope of fold angular magnification has a length of 44 cm the focal length of the objective is :
Options
A.44 cm
B.440 cm
C.40 cm
D.4 cm
Solution
In case of telescope,in normal adjustment,
m =
= 10
and fo + fe length of tube = 44
fo = 10 fe 10fe + fe = 44 ⇒ fe = 4
fo = 10 × 4 = 40cm
m =
= 10and fo + fe length of tube = 44
fo = 10 fe 10fe + fe = 44 ⇒ fe = 4
fo = 10 × 4 = 40cm
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